Text and Multiple Choice Profile Questions
You can add as many custom questions to the profile form as you wish. New for version 4 are "Checkboxes" which allows for multiple selection in Multiple Choice questions.
How did you find us?
Besides integrated Google Analytics, you can track how your members are finding you and include the information in your reports. You can add / customize your own entries and search the results.
Allow your members to spice up their profiles with premade questions. This is entirely optional for the member and the questions are completely up to you.